A braised tenderloin of beef that has been seared in a heavy skillet on all 4 sides until browned, about 3 to 4 minutes per side. As with all quadrupeds, the tenderloin refers to the psoas major muscle ventral to the transverse processes of the lumbar vertebrae, near the kidneys. The three main “cuts” of the tenderloin are the butt, the center cut, and fillet with bone tail.
